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Fair value measurements - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Business combination, contingent consideration, liability, current $ 1.7 $ 2.7
Senior Unsecured Notes Due August 2028 | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, fair value $ 292.5 $ 184.3